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Springer eBooks

Dynamical localization in the Paul trap — the influence of the internal structure of the atom

K. Riedel, Päivi Törmä, В. И. Савичев, Wolfgang P. Schleich

Published Jan 1, 1999• 0 citations
Publisher
DOI
10.1007/978-3-642-58600-2_5

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Journal of Modern Optics•Oct 1, 1997•5 citations
Coulomb crystals, containing up to a few hundred ions of which more than 50% were cooled sympathetically by the Coulomb interaction with laser cooled Mg+ ions, have been produced in a linear Paul trap. By controlling the balance of the radiation pressure from the two cooling lasers, the Coulomb crystals could be segregated according to ion species. Previous studies of ion crystals and molecular dynamics simulations suggest that the temperature may be around 10 mK or lower. The obtained results indicate that a wide range of atomic and molecular ions, which due to their internal structures are not amenable to direct laser cooling, can be effectively cooled and localized (crystallized) in linear Paul traps. For high resolution spectroscopy of such ions this may turn out to be very useful.
For the case of standing wave laser field, we investigate the internal dynamics of a Paul-trapped ion for different cases of the micromotion frequency by means of nonlinear Jaynes–Cummings model and compare our model with the pseudopotential model. The specific calculations show that, when values of dc and ac voltages are fixed, the larger the micromotion frequency is, the smaller the difference between the two models becomes and the larger the Rabi frequency is, for both within and beyond the Lamb–Dicke regime. Moreover, the property of the trapped ion staying whether on the node or on the antinode of the standing wave field is first presented.